I thought I saw one of these early this year at BKK, but roped off and semi-covered up...clearly not in use. Was it MMW or BKSC? And is it only at C/D transfer security and not also at domestic or intl regular security? For the uninitiated, two types of Nude-o-Scope technology:

MMW = millimeter wave (machine that microwaves you)
BKSC = backscatter (machine that irradiates you)

I'd bet that there will be no "opt-out" if these things are cranked up and the WTMD's aren't operating OR you are unlucky enough to be in the wrong line.

Dsquared--if you can, try to see if they are using as primary or only for secondary, or on some Thai random selection system.